Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 516, Issue 2, Pages 2189-2195Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac2300
Keywords
convection; binaries: close; stars: massive; supergiants; stars: Wolf-Rayet
Categories
Funding
- [NSF AST-2009713]
Ask authors/readers for more resources
The effects of convection and radiative losses on the predicted final separations of high-mass common envelopes are studied using observations of Wolf-Rayet binaries. Convection is found to have minimal effect in massive stars, as the orbit decays before convection can transport the liberated orbital energy to the surface. In low-mass systems, convection occurs faster than the orbit decays, allowing for radiative cooling and lowering of efficiency. Convection is a necessary factor in determining the outcomes of common envelopes.
The formation pathways for gravitational-wave merger sources are predicted to include common envelope (CE) evolution. Observations of high-mass post-common envelope binaries suggest that energy transfer to the envelope during the CE phase must be highly efficient. In contrast, observations of low-mass post-CE binaries indicate that energy transfer during the CE phase must be highly inefficient. Convection, a process present in low-mass and high-mass stars naturally explains this dichotomy. Using observations of Wolf-Rayet binaries, we study the effects of convection and radiative losses on the predicted final separations of high-mass common envelopes. Despite robust convection in massive stars, the effect is minimal as the orbit decays well before convection can transport the liberated orbital energy to the surface. In low-mass systems, convective transport occurs faster then the orbit decays, allowing the system to radiatively cool, thereby lowering the efficiency. The inclusion of convection reproduces observations of low-mass and high-mass binaries and remains a necessary ingredient for determining outcomes of common envelopes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available